Hermetically sealed motor compressor

ABSTRACT

A hermetically sealed motor compressor including a casing and a compressor body received therein and provided with a frame having a rim formed on the periphery, wherein there are formed notches in the upper part of the rim and there are provided springs, the bottom end of which is fitted into a socket in each notch and the upper end of which is fixed to a spring hanger so as to suspend the compressor body in the casing.

United States Patent [191 Matsuzaka et al.

[ HERMETICALLY SEALED MOTOR COMPRESSOR [75] Inventors: TakashiMatsuzaka; Tsuneo Koga,

both of Fuji; Kazuya Komiyama, Kamakura, all of Japan [73] Assignee:Tokyo Shibaura Electric Co., Ltd.,

Kawasaki-shi, Japan [22] Filed: Jan. 19, 1971 [21] Appl. No.: 107,681

[30] Foreign Application Priority Data Oct. 9, 1970 Japan 45-100176 [52]US. Cl. 417/363; 248/15; 248/21 [51] Int. Cl F04b 17/00; F16f 15/00 [58]Field of Search 417/363, 902; 248/15, 20,

[56] References Cited UNITED STATES PATENTS 3,089,639 5/1963 Hannibal248/15 1 June 3, 1975 FOREIGN PATENTS OR APPLICATIONS 1,353,639 1/1964France 417/363 Primary ExaminerWilliam L. Freeh Assistant Examiner-G. P.LaPointe Attorney, Agent, or FirmFlynn 8L Frishauf [5 7] ABSTRACT Ahermetically sealed motor compressor including a casing and a compressorbody received therein and provided with a frame having a rim formed onthe periphery, wherein there are formed notches in the upper part of therim and there are provided springs, the bottom end of which is fittedinto a socket in each notch and the upper end of which is fixed to aspring hanger so as to suspend the compressor body in the casing.

6 Claims, 7 Drawing Figures HERMETICALLY SEALED MOTOR COMPRESSORBACKGROUND OF THE INVENTION The present invention relates to ahermetically sealed motor compressor having a compressor bodyelastically suspended in a hermetically sealed casing. With compressorof such type, it is desired that the frame supporting electricallydriven members and compressor part received in the casing be elasticallysuspended therein.

I-Ieretofore, the compressor body has been elastically suspended in acasing by integrally forming projecting holders on the periphery of theframe and stretching springs across the holders and the hangers providedin the casing. With such a compressor, the spring holders have to bedisposed outside of the frame periphery due to requirements forconstruction, presenting great difficulties in rendering the compressorcompact. Further with the conventional compressor, the spring hangerassumes an L-form, one arm of which is fixed to the inner wall of thesealed casing and the other arm of which extends inward of the casingand is perforated with a tapped hole. The spring is fitted to the springhanger by being inserted into the tapped hole. This fitting method oftencauses any of the springs to fall off the tapped hole during compressoroperation, resulting in the occurrence of noises or compressor failures.Said method has further drawbacks that the necessity of screwing thespring into the spring hanger when the compressor body is placed in thecasing not only consumes a great deal of work but also requires thespring hanger to be bored with a tapped hole, unavoidably using aprominently extending horizontal arm. Accordingly, the fitting of thecompressor body into the casing results in the bulkiness of the casingand compressor body and further requires the frame of the compressorbody to be provided with an allowance or hole for insertion of thespring hangers so as to facilitate the fitting or removal of thecompressor body, thus making its construction extremely complicated.

SUMMARY OF THE INVENTION In a compressor according to the presentinvention there is bored a screw hole n the upper part ofeach notchformed in the rim of a compressor frame and the compressor body iselastically suspended in the casing by causing the hangers fixed to theinner wall of the casing to be clasped by springs. An object of thepresent invention is to provide a hermetically sealed motor compressorwhich is made compact by forming a spring fitting socket in the upperpart of each notch bored in the rim of the compressor frame.

Another object of the invention is to fit a spring into a cavity formedin the upper side or both upper and under sides of the extending arm ofeach spring hanger so as to prevent the spring from falling off saidarm.

Still another object of the invention is to incline the extending arm bythe pitch angle of the spring so as to fit it in an upright position,and, under normal condition, cause the compressor body to be onlysupported by the force vertically applied by the spring along its axis.

A further object of the invention is to fit the spring to the extendingarm simply by causing said arm to be clasped by the spring, therebyfacilitating the fitting of the compressor body into the casing.

BRIEF EXPLANATION OF THE DRAWINGS FIG. 1 is a longitudinal sectionalview of a hermetically sealed motor compressor according to anembodiment of the present invention;

FIG. 2 is a plan view of the frame of FIG. 1;

FIG. 3 is a side view with part of FIG. 2 shown in section; I

FIG. 4 is a plan view of a spring hanger;

FIG. 5 is an elevational view of the same;

FIG. 6 is an elevational view of the same to which there are fittedsprings; and

FIG. 7 presents a spring hanger according to another embodiment of theinvention.

DETAILED DESCRIPTION OF THE INVENTION Referring to FIG. 1, numeral 1represents a hermetically sealed casing which is formed by connectingupper and lower shells 1a and 1b with each other. A compressor body 2comprises a cylinder 3, an electric motor 4, a scotch yoke 5 forconverting the rotation of the electric motor 4 to a linear motion, apiston 6 made to slide back and forth through the cylinder by the scotchyoke 5 and a generally cylindrical frame 7 for suspending the electricmotor 4 and rotatably supporting the shaft 8 of the electric motor 4.

The electric motor 4 consists of a rotor 9 through which the shaft 8passes and a stator 10 fitted to the frame 7. As shown in FIGS. 2 and 3,the frame 7 assumes a generally cup-shaped form, and is provided at thecenter with a cylindrical bracket 7a projecting downward so as rotatablyto support the shaft 8 of the electric motor 4, and on the outerperiphery with a rim 7b. Between the bracket 7a and rim 7b is defined acavity 7c, into which there are received the rotor 9 and stator 10 ofthe electric motor 4 concentrically disposed with the shaft 8.

At the upper part ofthe rim 7b of the frame 7 are formed three or morenotches 12 spaced from each other at substantially equal peripheralintervals. The upper surfaces 12a of the rim which are defined by thebottoms of said notches 12 is made substantially plain (or flat), andpreferably disposed in a horizontal plane including the gravitationalcenter of the compressor body 2 or its neighborhood. The outside of theframe 7 and cavity communicate with each other through the notches 12 toexpel heat generated by the electric motor 4 to the outside of the frame7, thereby preventing temperature rise therein. Those parts of the rimsurface 12a where there are formed the notches 12 are each bored with aspring socket 13, with at least the center of said spring socket 13disposed inside of the outer periphery of the rim 7b. Into each springsocket 13 is fitted the bottom end of a spring 11 having the same pitch.

As shown in FIG. 1, the spring hangers 15 are fitted to the upper partof the lower shell lb to hold the springs 11, thereby causing thecompressor body 2 to be elastically suspended in the casing l by meansof the springs 11. Numeral 14 denotes a cylindrical member fitted to thebottom plate of the lower shell lb. Into the cylindrical member 14 isinserted the lower part of the shaft 8, the outer wall of which abutsagainst the inner wall of said cylindrical member 14 when the compressorbody 2 rocks sidewise. Accordingly, the cylindrical member 14 serves asa sort of stop means for preventing the excess oscillation of thecompressor body 2.

The spring hangers are, as shown in FIGS. 4 and 5, L-shaped memberscomprising of a fitting portion 15a and an arm portion 15b. The fittingportion 15a is fixed to the upper part of the inner wall of the lowershell 1b of the casing 1 by welding or other means. Each arm portion 15bextends inward of the casing 1 (FIG. 1), and an imaginary inscribedcircle defined by the free end face of the arm portion 15b usually has alarger diameter than the outer diameter of the frame 7. The uppersurface of the arm portion 15b is inclined by an angle 6 correspondingto the pitch angle of the spring 11 with respect to a horizontal plane.In said upper surface is formed a semicircular spring engaging groove 16by which the arm portion 15b is clasped between two adjacent coils ofthe spring 11 as illustrated in FIG. 6. The underside of the upper coilis fitted into said spring engaging groove 16, and the upper side of thelower coil is pressed against the underside of the arm portion 15b.Accordingly, the easy fitting of the spring 11 to the arm portion 15bfacilitates the incorporation of the compressor body 2 in the casing 1,permitting the arbitrary selection of its fitted position therein.Further the tight fitting of the spring 11 into the spring engaginggroove 16 prevents said spring 11 from coming off the arm portion 15b,thereby eliminating the occurrence of those noises or compressorfailures which have heretofore originated with such event.

The spring 11 is vertically held by the spring hanger 15 and, undernormal condition, the frame 7 is only suspended by a torsional forceapplied by the spring 11 along its longitudinal direction, offering theadvantage of eliminating the possibility of any lateral force beingapplied to the compressor body.

According to the embodiment of FIGS. 4 to 6, the upper part of eachnotch 12 is perforated with a spring socket 13 into which the spring isfitted. Accordingly, it is unnecessary to provide the outer periphery ofthe rim 7 with a large projection to hold the springs 11 or set them inplace by screwing as is the case with the prior art compressor. Even ifsuch projection should be required, it would only have to extend just alittle, so that the casing 1 could be reduced in radius at least by thatextent.

As mentioned above, the spring 11 is fitted to the spring hanger 15 byclasping the armed portion 15b by means of the spring engaging groove 16formed therein, so that said arm portion 1519 has only to extend inwardjust a little. Accordingly, said arm portion 15b does not obstruct theinsertion of the compressor body 2 into the casing 1 for assembly or itsremoval therefrom for repair, particularly eliminating the necessity, asin the conventional compressor, of providing the frame 7 with anallowance or hole to facilitate the insertion or removal of thecompressor body 2 by causing said allowance to slide along the springhangers or broadening the inner diameter of the casing 1.

As described above, the present invention can render the compressor bodycompact due to the use of the easing 1 of reduced size. Further, thecompressor body 2 is maintained in a horizontal plane including itsgravitational center or its neighborhood, so that if the compressor bodyshakes, the moment of inertia will decrease with respect to saidgravitational center, minimizing the effect exerted on the compressorbody 2 by its oscillation.

FIG. 7 presents a spring hanger 15 according to another embodiment. Inthis embodiment, there is formed a semicircular spring groove 117 alsoin the underside of an arm portion corresponding to the arm portion 15bof the embodiment of FIGS. 4 to 6. Formation of the spring engaginggrooves 116 and 117 in both the upper and under sides of the arm portion115b ensures the firmer clasp of the arm portion ll5b by the spring 11than in the embodiment of FIGS. 4 to 6.

What we claim is:

1. A hermetically sealed motor compressor includa hermetically sealedcasing;

a compressor body housed in said casing and comprising a generallycup-shaped frame having a generally circular rim extending downwardtherefrom, said frame being provided at the upper portion thereof with aplurality of substantially equally spaced notches for causing theinterior of said frame to communicate with the outside thereof, thebottom of each of said notches constituting the horizontally flat uppersurface of said rim;

a plurality of generally L-shaped one piece spring hangers equal innumber to the number of said notches, each spring hanger comprising afitting portion fixed to said casing and an arm portion extendinginwardly of said casing from said fitting portion, said spring hangersbeing disposed in said casing at a substantially equal peripheralspacing and with the free ends of said arm portions jointly defining aninscribed circle having a diameter larger than the outside diameter ofsaid frame;

a plurality of springs equal in number to the number of said notches,each spring having the lower end portion thereof fitted into a springsocket provided on the upper surface of the rim at the respective notch,and having the upper end portion thereof connected with the arm portionof the respective spring hanger by means of said free end of said armportion being inserted between two adjacent coils of the upper endportion of the respective spring; and

a substantially semicircular spring-engaging groove provided on at leastone of the upper and lower surfaces of the arm portion of said springhangers to receive one of the coils of its respective spring.

2. The motor compressor according to claim 1 wherein said arm portionsof the spring hangers are inclined to the same extent as the pitch angleof said spring with respect to a horizontal place so as to suspend saidspring substantially vertically.

3. The motor compressor according to claim 2 wherein the arm portion ofeach of said spring hangers is provided on the upper surface thereofwith a substantially semicircular spring-engaging groove for receivingthe upper coil of said two adjacent coils of the respective spring.

4. The motor compressor according to claim 3 wherein the arm portion ofeach of said spring hangers is provided on the lower surface thereofwith a substantially semicircular spring-engaging groove for receivingthe lower coil of said two adjacent coils of the respective spring.

5. The motor compressor according to claim 1 wherein the upper surfaceof said rim defined by the bottom of said notch lies substantially in ahorizontal place including the gravitational center of the compressorbody.

6. The motor compressor according to claim 1 wherein said casing hasupper and lower parts, the fitting portions of said spring hangers beingfixed to the lower part of said casing.

1. A hermetically sealed motor compressor including: a hermeticallysealed casing; a compressor body housed in said casing and comprising agenerally cup-shaped frame having a generally circular rim extendingdownward therefrom, said frame being provided at the upper portionthereof with a plurality of substantially equally spaced notches forcausing the interIor of said frame to communicate with the outsidethereof, the bottom of each of said notches constituting thehorizontally flat upper surface of said rim; a plurality of generallyL-shaped one piece spring hangers equal in number to the number of saidnotches, each spring hanger comprising a fitting portion fixed to saidcasing and an arm portion extending inwardly of said casing from saidfitting portion, said spring hangers being disposed in said casing at asubstantially equal peripheral spacing and with the free ends of saidarm portions jointly defining an inscribed circle having a diameterlarger than the outside diameter of said frame; a plurality of springsequal in number to the number of said notches, each spring having thelower end portion thereof fitted into a spring socket provided on theupper surface of the rim at the respective notch, and having the upperend portion thereof connected with the arm portion of the respectivespring hanger by means of said free end of said arm portion beinginserted between two adjacent coils of the upper end portion of therespective spring; and a substantially semicircular spring-engaginggroove provided on at least one of the upper and lower surfaces of thearm portion of said spring hangers to receive one of the coils of itsrespective spring.
 1. A hermetically sealed motor compressor including:a hermetically sealed casing; a compressor body housed in said casingand comprising a generally cup-shaped frame having a generally circularrim extending downward therefrom, said frame being provided at the upperportion thereof with a plurality of substantially equally spaced notchesfor causing the interIor of said frame to communicate with the outsidethereof, the bottom of each of said notches constituting thehorizontally flat upper surface of said rim; a plurality of generallyL-shaped one piece spring hangers equal in number to the number of saidnotches, each spring hanger comprising a fitting portion fixed to saidcasing and an arm portion extending inwardly of said casing from saidfitting portion, said spring hangers being disposed in said casing at asubstantially equal peripheral spacing and with the free ends of saidarm portions jointly defining an inscribed circle having a diameterlarger than the outside diameter of said frame; a plurality of springsequal in number to the number of said notches, each spring having thelower end portion thereof fitted into a spring socket provided on theupper surface of the rim at the respective notch, and having the upperend portion thereof connected with the arm portion of the respectivespring hanger by means of said free end of said arm portion beinginserted between two adjacent coils of the upper end portion of therespective spring; and a substantially semicircular spring-engaginggroove provided on at least one of the upper and lower surfaces of thearm portion of said spring hangers to receive one of the coils of itsrespective spring.
 2. The motor compressor according to claim 1 whereinsaid arm portions of the spring hangers are inclined to the same extentas the pitch angle of said spring with respect to a horizontal place soas to suspend said spring substantially vertically.
 3. The motorcompressor according to claim 2 wherein the arm portion of each of saidspring hangers is provided on the upper surface thereof with asubstantially semicircular spring-engaging groove for receiving theupper coil of said two adjacent coils of the respective spring.
 4. Themotor compressor according to claim 3 wherein the arm portion of each ofsaid spring hangers is provided on the lower surface thereof with asubstantially semicircular spring-engaging groove for receiving thelower coil of said two adjacent coils of the respective spring.
 5. Themotor compressor according to claim 1 wherein the upper surface of saidrim defined by the bottom of said notch lies substantially in ahorizontal place including the gravitational center of the compressorbody.